Hoist



F. P. LAWLER May 7, 1940.

HOIST 4 Sheets-Sheet 1 H UH H Rm 4 MN U ww m N mm mm Q Q NL mm mm M m PJ. m .H. H M m. 4H w rv w m m v &

Z4 TTORNEY y 7, 1940- F. P. LAWLER 2,199,668 HOIST Filed Aug. 4, 1937 4Sheets-Sheet 3 INVENTOR.

FRANK P. LjAWLER A TT ORNE Y May 7, 1940. F. P. LAWLER HOIST Filed Aug.4, 1937 4 Sheets-Shee t 4 INVENTOR. FRANK P.LAWLER yzwaw, ATTORNEYPatented May 7, 1940 UNITED STATES PATENT OFFICE HOIS'I Frank P. Lawlcr,San Francisco, Calif 'assignor to Charles H. Grant, San Francisco, PaulJ. Tyler, Oroville, Calif., and himself Application amt 4,1937, SerialNo.-157,317

7 Claims.

the power take-oil shaft of the tractor.

The object of the present invention is to generally improve and simplifythe construction and operation of, hoists of the character described; toprovide a. double drum type hoist, in which each drum is controlled by abrake of the brake-band type; to provide a hoist in which the brakes,drums and bands are interchangeable; to-provide a hoist in which poweris transmitted from a drive shaft to the drums through planetarytransmission gears, and in which the gears are enclosed to permit amplelubrication and at the same time exclude dust and grit; to provide ahoist in which the drums are journaled on and supported by extensionsformed in opposite sides of a central drive gear housing in such a waythat the cable or line pull reacts on the housing and not on the driveshaft; to provide alstructure in which outboard bearings are entirelyeliminated, so as to facilitate disassembly or renewal of the operatingparts; to provide a double .drum hoist which is controlled by two brakesand two secondary cooperatingbr'akes, and in which the two brakes arenormally held in applied position by a single helical tension spring;

and further, to provide a single control lever whereby the brakeandsecondary brake of either drum may be selectively released or applied.

The hoist is shown by way of illustration in i 1 the accompanyingdrawings, in which Fig. 1- is a plan view of the same, partially in.section; I

Fig. 2 is a cross section taken on line 11-11 of Fig. '1; said viewshowing the brake band in applied position;

Fig. 3 is a similar section showing the brake band in released position;

Fig. 4 is a cross section taken on line IV-IV, Fig. 1;

Fig. 5 is a perspective view of the planetary gear carrier; and

Fig. 6 is a perspective view of the complete hoist.

Referring to the drawings in detail, and particularly to Fig. l, Aindicates in general a drive gear housing, the inner end of which isprovided with a flange 2 whereby it may be bolted or otherwise securedto a suitable support, for instance,the transmission gear housing of atractor or the like. and journaled therein is a power take-ofi shaft 3on which is secured a bevel gear t. Extending Extending into the housingA.

through the housing in a direction transverse to the power take-oftshaft is a drive shaft B, and secured thereonis a gear 5 which is inconstant mesh with the gear 4. Formed on each side of the drive gearhousing are hub-like extensions 6-6, and journaled thereon are cabledrums 'l-Ia. Formed on each drum is an annular brake flange B8a, andsecured to each drum is an internal ring gear 8. Journaled on each endgear carrier, consisting of a hub portion H, and annular flanges lZandl2a, said flanges being provided with spaced bearing bosses i3, asclearly shown in Fig. 5. Intermediate of the bearing of the drive shaft,as at- Ill-l0, is aplanetary m bosses are journals Id and journal pinsMa, and 15 rotatable thereon are a plurality of planetary gears [5,which inter'mesh with the internal ring gears 9, and with. sun pinionsl6 secured adja-- cent opposite ends of the drive shaft. Bolted, keyed,orotherwise secured on the outer end of the hub members it are secondarybrake drums l'|lla, and surrounding said drums l'I-lla. and also thebrake flanges 88a of the respective hoist drums are brake bands 8l8a andIll-Isa.-

The manner of anchoring, ssupporting, and actuating the brake bands isimportant. Reference will be made to Figs; 2, 3 and 6. First of all, itwill be noted that the drive gear housing does not only serve as a.support-for the drive shaft B, the cable drums 1la., and thetransmission gears together with their brakes and drums, but it alsoserves as a support fora bar 'C whicha'functions not only as a supportfor the several brake bands and their operating mecha- 85 a maindownwardly-extending portion 23 and an extension at the upper end whichis disposed at right angles thereto, the links being pivotally attachedto the latter. This right-angle extension is extended as shown at 25 andis connected by cables 262$a or other flexible means to an arm 21secured on the shaft 28 journaled on the bearing 29 secured or formedcentrally of the anchor bar, said shaft being provided with a maincontrol lever 30 hereinafter to be referred to.

The bearing lugs 20 not only function as supports for the rocker arms 2|but they also serve to support and anchor one end of each brake andsecondary brake band, as indicated at 3| in Figs. 2 and 3. The brake andsecondary brake bands extend from their point of anchorage substantiallyaround their respective drums, and their free ends are connected throughlinks 32 with the forward ends of the rocker arms 2|. An adjusting nut33 is mounted on the outer end of each rod or link, to permit adjustmentand to compensate for wear, and a. spring 34 is interposed between thefree end of the band and a shoulder on the link, to force the bands awayfrom the brakes and secondary brakes when they are released. The brakebands are pivoted at the anchor points, and when they are released,gravitational movement would tend to cause the brake bands as a whole tosettle against the faces of the drums indicated at 35. But this isprevented in the present instance by providing downwardlyextending lugs36 on the anchor bar, which are provided with adjusting screws 31 whichlimit such movement and maintain uniform spacing and clearance betweenthe bands and the drums when in released position as shown in Fig. 3.

By referring to Fig. 6 it will'be noted that the downwardly extendingarms 23 of the common levers are connected by a helical pull spring suchas shown at 38, and that the tension applied may be adjusted byturnq-buckles as shown at 39. This spring serves one purpose, to wit,that of normally maintaining the common levers in the position shown inFig. 6, that is, with the bands l9-l9a applied and the bands l8-l8areleased. The position of the bands may however be reversed by operationof the common control lever 30. This is in neutral position in Fig. 6,but by swinging it to the left, a pull will be exerted on the cable orflexible connection 26, causing the links 22 to reverse their position,thereby releasing the band l9 and applying the band l8. It should benoted that when the common control lever 30 is moved to the left thebands l8 and I!) only are actuated, as a pull is exerted on the flexibleconnection 26 and no pull is exerted on the flexible cable 26a on theopposite side of the crank arm 21. On the other hand, if the lever 30 isswlmg to the right, the flexible connection 26 will remain inoperative,while a pull will be exerted on the flexible cable 26a, thus actuatingthe links 2| at the opposite ends of the anchor bar, and causing releaseof the band 19a and application of the band I 8a.

In actual practice, power will be transmitted to the power take-ofishaft 3 in any suitable manner, and from this shaft it is transmittedthrough the gears 4 and 5 to the drive shaft 13. If the common controllever 30 is swung to the left, the left-hand cable drum 1 will bedriven. This is accomplished as follows: as power is being transmittedto the shaft B, and the planetary gear carrier I0 is being held by thebrake band l8, power will be transmitted through the sun pinions l6thence through the planetary gears l5, from them to the internal ringgear 9 which is secured to the side of the left-hand drum I, thusrotating the same, as the band I9 is free. On the other hand, if thecommon control lever is swung back to neutral position, band I9 willgrip, due to the action of the spring 38, while the band 3 will bereleased, hence even though power 'is being transmitted through theshaft B, no

power will be transmitted to the drum, as the planetary gears will runfree within the ring gear, and the drum I! will dissipate the drivingpower in free movement. If the right hand drum is to be driven, theoperation will be the same, with the exception that the common controllever will be swung to the right.

It has previously been stated thatthe hoist here disclosed isparticularly intended for application to tractors. This may or may notbe the case, as it obviously may have other applications and uses.However, where it is applied to a tractor, it has certain structural andoperating advantages; for instance, in tractors of the socalledcaterpillar type, brake bands of the type shown at l8-I8a and l9-l9a areemployed for steering purposes. In this instance, the brake andsecondary brake bands indicated at l8l8a and l9--l9a are identical tothose employed in the tractor, and for this reason are interchangeabletherewith, this being an obvious advantage as spare parts carried forthe tractor ,may be employed in the hoist. Thus they are not onlyinterchangeable with the brake bands on the tractor but they areinterchangeable in the hoist, that is, they may be' moved from one drumto another with alacrity. The two drums indicated at l1-l1a areidentical in construction, and as such are interchangeable, and so arethe planetary gear carriers, the ring gear, the planetary gears, the sunpinions and the cable drums. A cover plate 42 is secured to each ringgear, and is provided with a felt or other type of oil seal 43, and assuch encloses the transmission gears, thereby permitting retention oflubrication about the planetary gears, at the same time excluding dustand grit therefrom. The wear and tear in a hoist of this character isreduced to a minimum, as the planetary mechanism which operates anddrives the cable drums is in torque balance at all times, andfurthermore there are no direct bending loads on the shaft B, as theentire load on the cable drums is taken up by the extensions 6 of thegear drive housing.

The operation of the hoist is exceedingly simple, as it is controlledfrom a single lever 30. By throwing it to one side one cable drum willbe driven; by throwing it to the opposite side the other cable drum willbe driven. By releasing it, it automatically assumes neutral position,in which both drums become locked, while the cooperating secondarybrakes simultaneously become released. Last but not least, the entirehoist is quickly applied to a tractor as it is secured on the flange 2,and when secured the entire hoist, together with the anchor bar, becomesan integral part of the tractor and is a self;contained unit formounting thereon. This permits of the entire hoist unit to be assembledat the factory and adjusted, without further adjustment being necessaryin assembly upon the tractor unit. In addition thereto, it will be notedthat the entire mechanism of the hoist, including the cable drums, thecooperating brakes, gears, brake bands, anchor bar and actuatingmechanism, are all'supported by the drive gear housing and all loads andstrains are taken up thereby.

For the sake of simplicity, no provision is shown on the drawings forthe introduction of lubrication to the bevel drive gear case, theplanetary gear cases or the drums, it being clear, that any standardprovision can be made for this. Slmilarly, no type of cable anchorage tothe drums has been indicated as any of the well known types of cableanchorage may be employed.

While certain features of the invention have I,

1. In a hoist of the character described, a drive.

gear housing having an extension on one side thereof, a cable drumjournaled and entirely supported on the extension, a drive shaftextending through and journaled within the housing, a planetary gearcarrier surrounding said shaft, a plurality of planet gears carried bythe carrier, a ring gear on the cable drum with which the planet gearsintermesh, a driving pinion on the drive shaft also intermeshing withthe planet geara'a band-actuated brake drum for securing the cable drumagainst rotation, a second bandactuated brake drum for securing theplanetary gear carriefagainst rotation and means for applying one brakeband and releasing the other to drive or look the cable drum, and acover member carried by the cable drum and forming a closure for oneside of the gears, said drum forming a closure for the other side of thegears to retain a lubricant and to exclude dust.

2. In a hoist of the character described, a pair of cable drums, a brakeand a secondary cooperating brake for each drum, a common springnormally holding both brakes in locked position to prevent rotation ofthe drums and simultaneously holding both secondary brakes in disengagedposition, a pivoted control lever adapted to be ,swung from a neutralinoperative position to one side or the other, a lever connecting eachbrake and its cooperating secondary brake, said levers being connectedwith the common spring and being normally held in a position where bothbrakes are applied and the secondary brakes held in disengaged position;and a flexible con nection between each of the last-named levers and thecontrol lever whereby when the control lever is swung to one side, onebrake and cooperating clutch is actuated, and when swung to the otherside the other brake and cooperating clutch is actuated.

3. In a hoist of the character described, a drive gear housing having abearing extension on each side thereof, a cable drum joumaled andentirely supported by each bearing, a drive shaft extending through thehousing and bearings, a planetary gear transmission for each drumwhereby poweris transmitted from the'drive shaft to each drum, a brakeand a secondary cooperating brake for each cable drum whereby thetransmission of power is controlled, said brakes and secondary brakesbeing band-actuated, an anchor bar secured to the drive gear housing,and means on said bar for securing one end of each brake bandf and forsupporting the bands, said anchor bar absorbing the operating reactionof the bands.

4. In a hoist-of the character described, a pair of cable drums, a brakedrum secured to each cable drum, a brake band for each brake drum, aplanetary gear transmission for each cable drum, a brake drum secured toeach planetary gear transmission, a brake band for each of said lastnamed drums, a common spring normally applying the brake bands to thebrake drums which cooperate with the cable drums to prevent rotation ofsaid cable drums, said spring simultaneously maintaining the brake bandson the drums which cooperate with the planetary gear transmissions inreleased position, a pivoted control lever adapted to be swung from a 6neutral inoperative position to one side or an-' other, a pair oflevers, one lever being connected with the respective brake bandswhereby one cab e drum and planetary gear transmission is ac,-

tuated, and the other lever being connected to 10 the respective brakebands whereby the other cable drum and planetary gear transmission isactuated, and said levers being connected with said common springand-being normally held in a position where both the brake bands holdingthe cable drums against rotation are applied, and the. brake bandsactuating the planetary gear transmissions are released, and a flexibleconnection between the control lever and the pair of levers, wherebywhen the control lever is swung to one side or the other the brake bandsecuring the cable drum on that side is released, ahd the cooperatingplanetary gear transmission brake is applied, and when the control leveris returned to neutral, the normal position of the brake bands isrestored by the common spring.

5. In a hoist of the character described, a pair of cable drums, a brakeand "a secondary cooperating brake for each drum, a common springnormally holding both brakes in locked position to prevent rotation ofthe drums and simultaneously holdingboth secondary brakes in disengagedposition, a pivoted control lever, a connection between said lever andthe respective brakes 8t? and secondary brakes, said lever adapted to beswung from a neutral inoperative position to one side or the other, saidmovement from neutral position in one direction first causing release ofone brake, and further movement in the same 40 direction engagement ofthe cooperating secondary brake, and movement from neutral position inthe opposite direction causing the same actuation of the other brake andsecondary brake.

6. In a hoist of the character described, a drive thereof, a cable drum'journalled and entirely supported on the extension, a drive shaftextending through and journalled within the housing, a planetary gearcarrier surrounding said shaft, a plurality of planetary gears carriedby the carrier, a ring gear on the cable drum with which the planetarygears intermesh, a driving pinion on the drive shaft also intermeshingwith gear housing having an extension on one side the planetary gears, aband-actuated brake drum for securing the planetary gear carrier againstrotation, a cooperating brake band and means for applying one brake bandand releasing the other to drive or look the cable drum, and means I onsaid carrier forminga closure for one side of the planetary gears, saiddrum forming a closure for the other side of the gears to retain alubricant and to exclude dust.

7. In a hoist of the character described, a drive gear housing having anextension on one side 35 thereof, a cable drum journalled and entirelysupported on the extension, a'drive shaft extending through andjournalled within the housing, a planetary gear carrier surrounding saidshaft,

rier, a ring gear on the cable drum with which the planetary gearsintermesh, a driving pinion on the drive shaft also intermeshing withthe planetary gears, a band-actuated brake drum for a plurality ofplanetary gears carried by the carsecuring the planetary gear carrieragainst roand to exclude dust, an anchor member secured to the drivegear housing, and means on said anchor member for anchoring andsupporting the bands and for absorbing the operating reaction of thebands.

FRANK P. LAWLER.

